JP2640836B2 - Mold making equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mold making apparatus for making a mold such as a core.

(Prior Art) Conventionally, various types of mold molding apparatuses for molding a mold such as a core have been proposed.
As seen in Japanese Patent No. 5746, the mold is moved between a blow station that blows molding sand into a cavity formed into a mold in the mold and an eject station that removes the mold after molding from the mold. Thus, a technique for sequentially performing the molding of a mold is known.

In addition, there is also known a technique in which a blow head that blows molding sand while fixing a mold or an eject device that ejects a mold is movably provided, and these are moved onto the mold according to a molding process. I have.

(Problems to be Solved by the Invention) However, in the mold molding apparatus as described above, in order to mold a mold, the mold is moved between a plurality of stations, or a blow head or the like is moved with respect to the mold. It has to be moved, so that the apparatus becomes complicated and large, and the cycle time required for one molding is long.

That is, the above-described apparatus requires an installation area of two stations, and requires components and mechanisms such as rail members for moving them, which is disadvantageous in terms of cost. It is.

In view of the above circumstances, an object of the present invention is to provide a mold molding apparatus that can mold a mold in one station.

(Means for Solving the Problems) In order to achieve the above object, a mold molding apparatus of the present invention provides an upper mold clamping mechanism for clamping an upper mold of a mold so as to be able to move up and down, and forms molding sand in the mold. A blow mechanism for blowing is provided so as to be able to move up and down, and the upper mold clamping mechanism and the blow mechanism are linked together to move up and down, and when moving up, a drive means for raising the blow mechanism by a predetermined amount and then raising the upper mold is provided. The means is configured to move only the blow mechanism upward during curing after blow molding to separate the blow mechanism from the upper mold.

The driving means includes means for vertically moving the blow mechanism by moving the blow mechanism up and down, and means for moving the upper mold clamp mechanism connected to the blow mechanism up and down; and It is preferable to configure with a means for changing.

(Operation) In the mold making apparatus as described above, the upper clamp mechanism and the blow mechanism are moved up and down in cooperation with the driving means,
At the time of blowing, the upper mold clamping mechanism and the blowing mechanism are lowered to close the mold, and the blowing mechanism is brought into contact with the mold.On the other hand, when curing the molding sand after blowing, only the blowing mechanism is moved upward. The mold is separated from the upper mold to prevent the molding sand in the blow mechanism from hardening, and when the mold is removed, the upper mold clamp mechanism and the blow mechanism are moved upward to open the mold.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

Embodiment 1 A mold making apparatus of this embodiment is shown in FIG. 1. The left half of FIG. 1 shows an operating state at the time of blowing, and the right half shows an operating state at the time of mold opening.

The mold 2 of the mold making apparatus 1 is composed of an upper mold 3 and a lower mold 4, and a cavity corresponding to a mold (not shown) such as a core is provided between the upper mold 3 and the lower mold 4. Are formed.
The upper die 3 is attached to an upper die holder 5, and the lower die 4 is also fixedly held by a lower die holder 6. The mold 2 is heated by a heater or the like.

Above the mold 2, a blow mechanism 7 for blowing molding sand S into a cavity in the mold 2 is installed so as to be able to move up and down. A mold clamping mechanism 8 is provided so as to be able to move up and down, and the two mechanisms 7 and 8 are moved up and down in cooperation with a driving means 9. At the time of up movement, the blow mechanism 7 is raised by a predetermined amount before the upper mold 3 is raised. On the other hand, at the time of curing after blow molding, only the blow mechanism 7 is moved upward to separate from the upper mold 3.

The blow mechanism 7 includes a blow tank 11 that stores a predetermined amount of molding sand S, and the blow tank 11 is attached to a support plate 13 via a support member 12. The support plate 13 is supported movably up and down by guide rods 15 slidably disposed on both sides of a frame 14, and the support plate 13 is provided with an upper die The cylinder 16 is connected and is moved up and down.

On the other hand, the upper mold clamping mechanism 8 includes upper hangers 17 on both sides capable of engaging the ends of the upper mold holder 5 from below, and the upper hangers 17 are connected to the lower ends of the guide rods 15. In addition, a blow tank elevating cylinder 18 is connected between the support plate 13 and the blow tank elevating cylinder 18, and the relative distance from the support plate 13 is adjusted by the expansion and contraction operation of the blow tank elevating cylinder 18.

Further, a flexible charge hose 20 for supplying molding sand S from a hopper 19 installed on the upper portion of the frame 14 is connected to the blow tank 11, and a supply port opened laterally into the blow tank 11 at an end thereof. An opening of the supply port 21 is provided with a flap valve 22 made of a rubber plate. Further, an air hose 23 for supplying pressurized air to the internal space is connected to the blow tank 11, and a proximal end of the air hose 23 is connected to a pressure source (not shown) via an air switching valve 24. Then, pressurized air is supplied at the time of blowing, and the molding sand S in the blow tank 11 is fed into the mold 2 from a blow nozzle 25 formed at the bottom of the blow tank 11.

Further, an upper eject pin 26 is installed in the upper mold 3 so as to be able to be inserted into the upper mold 3 through the blow nozzle 25, and the upper eject pin 26 extends upward through the guide 27 and extends upward. The eject plate 28 is supported by a plate 28, which is connected to the support plate 13 via an upper eject cylinder 29, and is moved up and down by the expansion and contraction operation of the upper eject cylinder 29.

On the other hand, a plurality of lower eject pins 30 are fitted into the lower mold 4 of the mold 2, and the lower eject pins 30 are supported by a lower eject plate 31. The lower eject plate 31 is vertically moved by a lower eject cylinder 32. Driven by the operating plate 33. The lower die 4 is clamped by a lower die clamp 35 that moves up and down with respect to the fixed base 34. The lower die clamp 35 is provided with a transport roller 36. The lower die 4 and the upper die 3 are mounted on the dies, so that the dies 2 can be carried in and out in accordance with the step change.

The molding operation of the mold according to this embodiment will be described. The right half of FIG. 1 shows a state in which the upper mold lifting cylinder 16 is shortened and the mold 2 is opened.
The support plate 13 is lowered by extending the 16 and the upper mold 3 supported by the upper mold hanger 17 is placed on the lower mold 4.
Subsequently, the upper mold elevating cylinder 16 is further extended and the blow tank elevating cylinder 18 is shortened, and the blow tank 11 is further lowered to bring the blow nozzle 25 into contact with the upper mold 3.
It is assumed that the left half of FIG. Then, in this state, pressurized air is supplied into the blow tank 11 to fill the molding sand S into the mold 2 to perform blow molding. Molding sand S is mold 2
When the cavity is filled, the supply of the pressurized air is stopped (exhausted), and the blow tank 11 is raised by the operation of the blow tank elevating cylinder 18 to be separated from the mold 2 so that the molding sand in the blow tank 11 is removed. Avoid that S is hardened by the heat of the mold 2. In this state, curing for curing the molded article S filled in the cavity by the heat of the mold 2 is performed for a predetermined time.

After the blow molding as described above, the blow tank 11 is lowered onto the mold 2 again, and then the upper eject cylinder 29 is extended to move the upper eject pin 26 downward to separate the mold from the upper mold 3. The upper die 3 is raised together with the blow tank 11 by the upper die lifting cylinder 16 while performing the die. After the upper die 3 is lifted, the upper eject pin 26 is also raised, and the blow tank 11 is further raised to be separated from the upper die 3 to avoid the influence of heat. Then, as shown in the right half of FIG. 1, the mold 2 is opened, the lower eject cylinder 32 is operated, the lower eject pin 30 pushes up the mold formed from the lower mold 4 to release the mold, and removes the mold. is there.

In the blow molding, the amount of the molding sand S in the blow tank 11 is reduced by blowing the molding sand S from the blow tank 11. However, when the internal pressure of the blow tank 11 decreases, The molding sand S is replenished by opening with the weight of the sand.

Embodiment 2 This embodiment is shown in FIG. 2 and FIG. 3. In this embodiment, the blow mechanism 7 is the same as the previous example, and a hanger that opens and closes is used as an upper mold clamping mechanism 38 for supporting the upper mold 3. The mechanism of the driving means 39 is changed accordingly.

The upper clamp mechanism 38 has a pair of opening / closing hangers 41 (see FIG. 3) pivotally supported by a supporting member 12 connecting the blow tank 11 to the supporting plate 13 so as to be capable of opening and closing. A cylinder 42 is provided to open and close the opening / closing hanger 41 to switch the lower end of the opening / closing hanger 41 into and out of engagement with the upper die holder 5 of the upper die 3.

In this example, the blow tank elevating cylinder 18 in the previous example is unnecessary, and the upper die elevating cylinder 16 is not required.
However, when the opening / closing hanger 41 is in the closed position, the blow tank 11 is first raised by a predetermined amount and the tip of the opening / closing hanger 41 When the upper die holder 5 is engaged with the upper die 3, the upper die 3 is opened.

Others are provided in the same manner as in the previous example, and the same structures are denoted by the same reference numerals and description thereof will be omitted.

Next, the operation of this embodiment will be described. The right half of FIG. 2 shows a state in which the opening / closing hanger 41 is closed and the upper mold lifting / lowering cylinder 16 is shortened to open the mold 2, and from this state, the upper mold lifting / lowering cylinder 16 is extended to operate the support plate. 13 is lowered, and the upper die 3 supported by the opening / closing hanger 41 is placed on the lower die 4. Subsequently, the upper mold lifting cylinder 16 is further extended, the hanger opening / closing drive cylinder 42 is shortened, and the opening / closing hanger 41 is opened.
, And the blow tank 11 is further lowered to bring the blow nozzle 25 into contact with the upper mold 3, thereby bringing the state of the left half of FIG. 2 into the state. Then, in this state, pressurized air is supplied into the blow tank 11 to fill the mold 2 with the molding sand S to perform blow molding. When the molding sand S is filled in the cavity in the mold 2, the supply of the pressurized air is stopped, and the blow tank 11 is moved up by the operation of the upper mold lifting / lowering cylinder 16 and separated from the mold 2. It is avoided that the molding sand S inside is hardened by the heat of the mold 2. In this state, the molding S filled in the cavity by the heat of the mold 2 is cured for a predetermined time.

After the blow molding as described above, the blow tank 11 is lowered onto the mold 2 again, and the opening / closing hanger 41 is closed.
Then, the upper eject pin 26 is moved downward to release the mold from the upper die 3, and the upper tank 3 is raised while the blow tank 11 is lifted up from the upper die 3 by the upper die lifting cylinder 16. After the upper die 3 is raised, the upper eject pin 26 is also raised, and the upper die 3 is further raised to open the mold 2 as shown in the right half of FIG. Then, the mold formed from the lower mold 4 by the lower eject pin 30 is pushed up, released, and taken out.

According to each of the above-described embodiments, the blow mechanism 7 is provided with the upper mold clamping mechanisms 8 and 38 in combination, and the blow mechanism 7 incorporates the eject pin 26. The opening and closing operation and the ejecting operation of the mold 2 and the mold 2 are performed to eliminate the movement between the stations, thereby improving the operation efficiency and simplifying the apparatus.

(Effect of the Invention) According to the present invention as described above, the upper mold clamp mechanism and the blow mechanism are driven to move up and down in cooperation with each other, and only the blow mechanism is moved upward when the molding sand after the blow is cured. By separating from the upper mold to prevent the hardening of the molding sand in the blow mechanism, and at the time of removing the mold, the upper mold clamp mechanism and the blow mechanism are moved upward to open the mold, so that the stations are separated. 1 without movement
Molds can be molded in one station, simplifying equipment, reducing installation area, omitting components and mechanisms, which is advantageous in terms of cost, and shortens the cycle time required for one molding. Operating efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view showing an operating state at the time of blowing and an operating state at the time of mold opening in the right half of the mold making apparatus according to the first embodiment of the present invention, and FIG. Fig. 3 is a partial sectional front view of the mold making apparatus according to the second embodiment, showing the operating state at the time of blowing in the left half and the operating state at the time of opening the mold in the right half. FIG. 1 ... mold making apparatus, 2 ... mold, 3 ... upper mold, 4 ...
Lower die, 7 Blow mechanism, 8, 38 Upper clamp mechanism,
9,39 ... Drive means, 11 ... Blow tank, 13 ... Support plate, 15 ... Guide rod, 16 ... Upper mold elevating cylinder, 17 ... Upper hanger, 18 ... Blow tank elevating cylinder, 41 … Open / close hanger, 42… Open / close drive cylinder.

Claims (2)

(57) [Claims] 1. A mold forming apparatus, wherein blow molding sand is blown into a cavity of a mold formed by an upper mold and a lower mold to perform blow molding, and the mold is opened to take out the mold after the blow molding. An upper mold clamping mechanism that clamps the upper mold of the mold is provided so as to be movable up and down, and a blow mechanism that blows molding sand into the mold is provided so as to be movable up and down, and the upper clamp mechanism and the blow mechanism are linked to move up and down. In the upward movement, a drive means for raising the blow mechanism by a predetermined amount and then raising the upper mold is provided, and the drive means moves only the blow mechanism and separates it from the upper mold at the time of curing after blow molding. A mold making apparatus characterized by the following. 2. The method according to claim 1, wherein the driving unit moves the blow mechanism up and down to move an upper clamp mechanism connected to the blow mechanism up and down; 2. A mold forming apparatus according to claim 1, further comprising means for changing a clamping position of the mold.